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Online guide for hobby-level DIY thermocouples?

Discussion in 'Electronic Design' started by _, Dec 2, 2007.

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  1. _

    _ Guest

    I think I'd like to experiment measuring temperature with some small
    electrical meters - freezing to boiling or a bit higher. Pointers to
    useful info on the web sought - thanks...
     
  2. Do a Google search for [thermocouple tutorial].

    You might also search for [Seebeck effect tutorial], since
    this effect is the cause of the voltage produced by a
    thermocouple.

    You might start with:
    http://en.wikipedia.org/wiki/Thermocouple
    http://www.fis.unipr.it/pub/materia...National-Instruments-Application-Note-043.pdf
     
  3. That's not a great range in which to be using a thermocouple. Did you
    have some specific reason to want to use a T/C?


    Best regards,
    Spehro Pefhany
     
  4. _

    _ Guest

    No - just thought that for an analogue meter a device that made
    (milli)volts all by itself would be likely to keep things simple. What's
    better?
     
  5. A thermistor or semiconductor sensor would be simpler to work with.
    National, for example, has some. Thermistors are nonlinear so a bit
    harder to work with, but cheaper and more accurate in quantity (not
    necessarily more stable). A coil of copper wire can be a cheap
    temperature sensor. A loose coil of thin Pt wire is one of the most
    stable temperature sensors made. If you are not so fussy, a thin film
    of the stuff will do. HVAC folks use thin films of base metal stuff
    like nickel.

    Here's a semiconductor sensor that costs around $1 in small
    quantities: http://cache.national.com/ds/LM/LM94022.pdf

    You need a sensor such as the above in order to be able to use a
    thermocouple anyway! (for cold junction compensation).


    Best regards,
    Spehro Pefhany
     
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